Thanks to the-horo and arthurzam, bug #900767 is finally fixed upstream[1] and in dev-java/javatoolkit. However, the package name 'javatoolkit' implies something more powerful and complex. For using it in java-pkg_verify-classes() of java-utils-2.eclass I would appreciate having a package name reflecting purpose or functionality, maybe 'dev-java/class-version-verify'. Such new package should not contain anything which isn't needed for that purpose. [1] https://github.com/gentoo/javatoolkit/commits/master/